On the early stages of localised atmospheric corrosion of magnesium–aluminium alloys
Journal article, 2020

The surface film on pure magnesium and two aluminium-containing magnesium alloys was characterised after 96 h at 95% RH and 22 °C. The concentration of CO2 was carefully controlled to be either 0 or 400 ppm. The exposed samples were investigated using X-ray photoelectron spectroscopy, Fourier transform infrared spectroscopy, X-ray diffraction, and electron microscopy. The results showed that when the alloys were exposed to the CO2-containing environment, aluminium cations (Al3+) was incorporated into a layered surface film comprising a partially “hydrated” MgO layer followed by Mg(OH)2, and magnesium hydroxy carbonates. The results indicated that aluminium-containing magnesium alloys exhibited considerably less localised corrosion in humid air than pure magnesium. Localised corrosion in the materials under investigation was attributed to film thinning by a dissolution/precipitation mechanism.

Author

Mehrdad Shahabi Navid

Volvo Cars

Yu Cao

Chalmers, Industrial and Materials Science, Materials and manufacture

Jan-Erik Svensson

Chalmers, Chemistry and Chemical Engineering, Energy and Material, Environmental Inorganic Chemistry

A. Allanore

Massachusetts Institute of Technology (MIT)

N. Birbilis

Australian National University

Lars-Gunnar Johansson

Chalmers, Chemistry and Chemical Engineering, Energy and Material, Environmental Inorganic Chemistry

Mohsen Esmaily

Massachusetts Institute of Technology (MIT)

Scientific Reports

2045-2322 (ISSN)

Vol. 10 1 20972

Subject Categories

Inorganic Chemistry

Materials Chemistry

Corrosion Engineering

DOI

10.1038/s41598-020-78030-w

PubMed

33262431

More information

Latest update

12/10/2020